<div class="bubble-ring">
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  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
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  <div class="bubble"></div>
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  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
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  <div class="bubble"></div>
  <div class="bubble"></div>
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  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
</div>